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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2befb48549e84de6eebea458a2cbb2ae559541c13d667dccf5a2a866f3aec99' 
  AND token = 'PzKGJX+udzYMB7eNLFYKpcxfyqJ2XZlAXlPCoBYai4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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