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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be731b7dd3c5403bdab32ed4a7de467c490fa3de336a10fb85723071ceb6a9ca' 
  AND token = 'C6JJUOVIJAM5lCdjD7cEGXYMPl7sJxOpFveVii36d8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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