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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c501e65def8ce3fa576591eaf3c6de6792fb5045aa2e1bc0c2480cfd4c9dc16f' 
  AND token = 'CSVAopL3sWUJ3O76XQQ6sUQN6i3/Fh+cq7B0skhwuIU=' 
  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"
    }
  }
}