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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93d268110fc45c3703861c1a6a117d28a4fe2ca4ed59391b4fa6e5748169183' 
  AND token = 's2edZLCMQmQw5vXzYNscb9bGwd4ojbqRYU6UTJ/0dn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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