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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f51def6718ade79ab7da16732265d9519b233c063f02350a830c1e9ee35dbe' 
  AND token = 'HyviPxCF4piwdB/eg9Qd6UYAvjzd3RRA90Hsnt82iy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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