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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954c5b1115bd4462a4c7a26240154ce2632cd3061fa7f047745f63bc81c13dd6' 
  AND token = '8sWftk6XclLzVm3+arwFQsP0wgfiOe59OepT+Pu9/fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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