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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b498ec8680ced60b554d19db9bb929e8398e6cd4a8e2e24b8ddd0b5a420f3f' 
  AND token = 'fEwPqFrJ77rjnwXrxsFli3YM0ohhd6Pu3FmAHwdxgOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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