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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9779562b4308e0d430bdc81492be074f47c080ff74fc44d58db3e4e98dbf80bb' 
  AND token = 'HdIvHrWrwfaNRnJmpcF+/iHNorPAR9rVeHqEJutgUco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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