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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e503d306d051a87905acd1c91e199527a5501af4eec668f452c5aa96d154894' 
  AND token = 'uVTy+HHqFUV5/MKcPsV2x/U5EekHLMMFT1JPN7G7DWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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