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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9a68d4ce560c777d98252bf84573f086dd4b8c15e19176cc2ceb6e388e4ea3' 
  AND token = 'Tk1FEYUlR8zRb7yFPYwCJFEVAYKkaL20JpZUXRFQenk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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