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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a599bddcca452d876c1abe279d44febe2c41af9a36eea9b5f84634a5cddeb67' 
  AND token = '7Dz62kcj4q7rAuC+/cbQwf9PIEm/GBgLQM712t1nNp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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