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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd650e04156050c9c4b4784d9e06c7ee4f638c2911dbf6606ba39f5d127e32a' 
  AND token = 'lGvRSdb+0uAQKyPvr7kXRw+1n3yFfC46lnoErm7zDlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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