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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f382a5bf509df7c8b63f080a1781803bc22f47042a195a4158ac03412e6009dc' 
  AND token = 'VFbkOYd9E5kxqMC6o7Nb5B1/SG5dNK7mqnXNR7tkkW8=' 
  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"
    }
  }
}