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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d97ee4ef542a51173b4580cf008ccf8d792d272f556e864b49636848f2080f' 
  AND token = '8JAH5OttmNtRnm1OQvVmPn3UNe4C2Yz2DPyXZ7ls1AA=' 
  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"
    }
  }
}