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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffe5eabe06d8b1fc49f6962e95b9d94141851d90f33f3dfe43dea0f8bd10b60' 
  AND token = 'Lh9AiAAGeuD+PHk6mW8Ly1/PczixXniTtDTL6uv5IEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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