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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27462e9edb1b72e8b432f8b2976a8bb1f734a000f5c2e04bc899582078bad620' 
  AND token = 'RTNq9LSkp5VzQxME7u6Qpf6+el8y+WhUdY1woP/gPcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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