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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bda7ba722c9f47835b9cfdf01a08b337682ef4b72e8600e9782e01144f2614b' 
  AND token = '+Tdt6PXYOREdd/4862c6iJqV1ahyYGvD+TSg5XQJzIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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