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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cc19aadd6cceb184b2f6e398a1f53f032dc07d0cfd4026f407b51311ba36fe' 
  AND token = 'De2pswjhTi8ggUDT0FauM5nEM4E4JxktyQBiWPI1lYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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