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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8760eba7527c774014386bf9aece98c3cbf236675a22b8930731e7c1899ad2b' 
  AND token = 'HPtUoBtQhzeRi0E7JC8N2t18R/QdENf4TarUZEHUsBU=' 
  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"
    }
  }
}