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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ec52087b57d4c5edb405af53ac5f9eb231c4ba0a99de1e4c60e0687efdd487' 
  AND token = 'mvVvaFUyDuceD0tSdNczk9GUKLTlU7vAfR45LzeetsU=' 
  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"
    }
  }
}