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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bce26876f2313d0da64aa3e24367a13c6f0d334a877f0af83a569c0ddf6024' 
  AND token = 'uO+MtY9T7HhZGVWJcOjJQMu0LxeZxFBk5D78p4ZE5Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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