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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514d8d907954d39e5997e988fe5186da27639796c73b6b03d88e7f451cfac1df' 
  AND token = 'kyfd74L/Lu6nvgbo3f2MX59HWKHxozXLtTHaYAUvE1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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