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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2661e58c836ec8d80e2ff49ed3c34a0ae1236e5b07613d7b3f8f4949fe5c152f' 
  AND token = 'BBueiansIKna7a22wAm5p8dl/u5q1z3ov7YLE1H4Nu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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