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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9cf59e317d127101bfe7ea927d06cf6714903b1561ad4db2b854216468d562' 
  AND token = 'Nl4EDqyisknhx3FPYRxV3ZFnZb+VG54q4T7tkQWXvAc=' 
  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"
    }
  }
}