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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e841492bdc98856d67985810db42e20269d6ea1d9a3d00871ae954881992ef' 
  AND token = 'RKk72hHqevVh0JnAMOhLnVK7R1H6lgaD5Mq5DTpFAy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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