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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f89aad930990edb25c7bee7b6c74e6c90f9fa237c6de1f8222d63163ab7cbd' 
  AND token = 'f2MajvBepbUQaqAvx3gBxXrWw876ofFUTeMFV1AcyVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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