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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b095053cc0d71e918a44c1e874dc8c5c2b7750714e870fe3ea7a5becfa7b43f1' 
  AND token = 'b7ReRnDm9q9FgoFqLdlY+CquHFc4jOqFzBoArssDGhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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