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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65d67bc3a8ad979aecce38e22b6f3ba88f6689dec2572546eb5da3fe4a4dc40' 
  AND token = 's5IAf3/gC6IElfOMRCaYw4grts5qUQnp9xYRfhP6IHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}