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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c274b5a61e451fd0cb0bb08342d9c3b991eed8b27d1d23d77db489898e63088b' 
  AND token = 'IxztEJ5BtlJDJ9tu4NauCY508hJW7KUvkxO4qJqjzow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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