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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca162e91f9adc1ab642ea40dcd5eaaffac363d693215e8e037b9cf1b9991e156' 
  AND token = 'UK+fP2XRoQf2jx1FPxi1tis/1i6sPufltgxcl4kiLUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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