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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43d47eebd5173de05c5f142b310034d3c7900c10bc300db5328eb84bf8c29d87' 
  AND token = 'Fo5D08RA5aZ8+9yzalvgt7C/LNRcBHzc/4WYGEuB4gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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