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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda56d70d8d02dd874ee20452de4fb864875bbb6e44185c69d9b2e9137f704a6' 
  AND token = 'bX1T1jamocR92h7MzJxcieIfvYQVbgZ2I80V1gCvK50=' 
  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"
    }
  }
}