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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623db7d0548d07a61f328d37ccaeaf23ab2636b32f4a9ac22eadef3da838cd86' 
  AND token = 'Ncz2DQdQ1D9jl3ttT8uJr6cP2mtQMKNdiJ0VCv01aQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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