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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad2e2f0be21c7347f4edfe2a3fb8d985ed16dc6c7f3ff803e1c875397d6defb' 
  AND token = 'ZsHNm2csXburxcCUwYnCL3bxAfpE45bCfbQu5ySQ2LQ=' 
  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"
    }
  }
}