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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452fb148d1ba84b00e256d8e9110f61714cfb344acb945e00ee0fa7e9b9efb06' 
  AND token = '8v3JvD6SwSHFffU77+XAoaHzVi92TYNvGoXEswDNj2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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