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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb93871f76a9e0b8cfe60d8b39bdc15e0ce89f3238506592d3e8d2cd3ec5fc4b' 
  AND token = 'Pox8RbaaMH7J1ub38l4QOsPna0jSpkVl+Zm13tB9piY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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