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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579c311781acde3f0261fc07b6da6a921a084d32adf2aa042dab3445b8074700' 
  AND token = '6GJei3xUOdkmdwGaz1PGb0c3oIFo8SV12Ep14WgK0xk=' 
  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"
    }
  }
}