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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedad7d98e7bc6987dbdce8775ef52fa9a5dbb69a72d89fbbfc3279e12134a0e' 
  AND token = '7nBjeus/Jz5dywYxqw7m+lKJwl/xbe/XkwsDASgoQnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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