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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b945c1f3ce9071e150bbccabaa77872a024ebd958f5c791af0791f2908e774ec' 
  AND token = '8LaWuGBm2r4Ujnvdcy6QPq8cMrCoDQ+rea0dSfpzLWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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