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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c5baa3ac569896411cab8ddbadef635ce08c389df9498dd4f9627e9d415c1b' 
  AND token = 'xckYLYXTCASOuvLiK7ahpA/7zYOYMIjBnSCGm7zmlec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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