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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67ebf145ab60dfecfbf6d5584e65ecb14490416db893a799ff405c632a502e1' 
  AND token = 'dnPOEW4BIVYegJCliD36RhTItUsnpJyXDrBELRf95FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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