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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb8531059d41acdb3906c3e1a00947661b6dd228830387a1d6b5328eed73638' 
  AND token = 'WA/vZp/vyPE8zi1+UhUx5ddKiSsyL5Heznd53ZBN1OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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