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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae85fbe5f7e8f4092796c6c705c9db5cd3bb894e438cea86fb9157cecd3776ed' 
  AND token = '1/Nv7f+LovHCBKgRdT5e6/G8+RYpiAt7OQIioZJyR7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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