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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eed8d5047084e41cb293d3195e7fd4d4ed6ae572303af1f861a407b6009196c' 
  AND token = 'bAsO0ppRPD3EX3XRT6VpHtxNVztWHs10ldta1SKEkUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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