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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c657873a8ac3843cb20334aa4b6f06c06b99fb231aa2da686b213f20e8316fe' 
  AND token = '+TU3KNwK9GGhdFwQfa7yXlkJyFa2ZzQdBhi31AUvMFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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