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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b793aacb5767e1f474dd418858eafedd5ebab2a9e355f9fb125acacd3b0a3a4' 
  AND token = 'Tcn4kr1gH9ky9pH0x73y9ukIdBjIr2mdYzStW7QJI08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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