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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c91e995ca7fb7ab15c83fb032c73deb3748c11793442822df61af8f2dfc114a' 
  AND token = '2hCQUX1r9fK5ows+YRwZotMRl0Q6enxUykPWw3ubvKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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