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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0044d6bb76c823c7cdd02ca0b8315e07a41d33adde4287584cf84cdb387d12c4' 
  AND token = 'zbGCBvatmfvwmtp20BDE7XjpkEQb/3/zEGogjxJ0eBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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