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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83f4fc787956e40e4cb2e63d9dbf0cb078c94164578157332ba49f063be078f' 
  AND token = 'VDMfn8oy/wB9i0yVKwqc0OFIt9ZIH/4vB6R10Qi0s8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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