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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad54798a2faad3b49e2ccb0ade62d508b100fa50942ce2470cc72c6581e56d5b' 
  AND token = '4oDiT7oECITIhqCbSbt53KPvQ9JreGhGvR1e5k+BGVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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