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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d34c8dd4d5d4739f51ad3d6ad69862145b17aa69d0b331891d70d789312f53' 
  AND token = 'wAaVRivWwQ5k7N+47hrkSncyxjXkWLtmWGpl9lQww1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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