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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40741db3d3e2da8eda88fe98b72c4c795236153a9e71f94ce21a3222f33ee64' 
  AND token = 'O8LCAGN9CkMRBMU8iTofClG6sMk9ByPnc3Sf704K2TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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