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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1506ab5facf1c294a09911ba1c10157dca8c0d9d741e73acb9092b72c57c716f' 
  AND token = 'fJCeoEcM4ax3nrMoWGPqGrztMSdN/K9VCgBnrqcv4ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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