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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfebf91933b1a91f3f95e1ecc62a4f4f0320bd3fa02f4f5d915a7f49849b2b7' 
  AND token = 'R3/2JqIanrVMJpXaKMa7euGl21RK0sf7o/Sp64iudcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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