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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49eb6bc1d19508da4316658a2dfa1c3c7769888343cfbcbc3923cfd1f4cdd11c' 
  AND token = 'xfX0oPhonPQIUQUdqcPh6x8nfYOcke9QepnZZx7/5Jg=' 
  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"
    }
  }
}