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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7b05e08673dce9674028b29d12b5ba3da3f34be4f87f738bfc4f6e2a9e2fd7' 
  AND token = 'J7Dl/daKictBPPc/u6kYJZUrzruL3vqTnNcnD8nKbpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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