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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef94a245ada9bab842047f176c19725c6a85a65099ef0f64642dd95d35102b3' 
  AND token = 'LjW+4lcYo28T2ryKpyfYiKeHD32vMFjw+dFia3LpcT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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