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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598facf14d0cb3eb93404441d8c92b220a74f2bd0fed45d277b12e22f816e300' 
  AND token = 'DxnERljGlXTZhx9oLETHDIuOT1MDfE9d20uYCfqHEG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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